Lamination of plastic packaging films

Abstract

Abstract Plastic film laminates for use in the packaging of food products and other materials are formed by adhesive lamination of polyethylene films to films such as nylon, polyester, cellophane, polypropylene, polyethylene, polyvinyl chloride, etc., by adhesive lamination. The polyethylene portion of the laminate provides for heat sealability of the resulting film laminate. The nylon, polyester, cellophane, polypropylene, etc., film gives flex strength, abrasion resistance, gloss, vacuum formability, barrier properties, etc., to the wound laminate. These film laminates are particularly useful in vacuum-forming packing machines and for manufacturing plastic pouches. In the manufacture of the film laminate, a pressure-sensitive but curable adhesive is applied to one of the plies of the film laminate on an ordinary plastic-film-printing press and the two films combined and rolled up on a windup reel. The pressure applied to the film laminate in the windup reel is the only laminating force applied to the film and the film laminate is cured simply by being stored under pressure of being wound on the rolls. After curing of the adhesive, the plastic film plies cannot be separated without being torn. If desired, the film to which the adhesive is applied may also be printed prior to application of the adhesive so that the resulting film laminate is provided with a desired imprint positioned between the film plies.

Inventors

• 👤 Myron S Beyer
• 👤 Stanley Manne
• 👤 G R Ramagopal

Bibliographic Details